Abstract
Context
Landscape structure can affect seed dispersal, but the spatial scale at which such effect is maximized (scale of effect, SoE) is unknown.
Objectives
We assessed patterns and predictors of SoE on the seed rain in two Mexican regions: the relatively well-preserved Lacandona rainforest, and the more deforested Los Tuxtlas rainforest. We hypothesized that source limitation at Los Tuxtlas makes seed dispersal more reliant on landscape patterns measured across larger spatial scales, especially when considering connectedness-related landscape metrics and dispersal-dependent responses.
Methods
We recorded the abundance and diversity of tree seeds in 20 forest sites per region, separately assessing local (dropping from neighboring trees) and dispersed (immigrant) seeds. We measured forest cover, fragmentation, and matrix openness in 11 concentric landscapes surrounding each site and tested for differences in SoE among regions, landscape metrics, response variables, and seed origins.
Results
Contrary to expectations, SoE did not differ between regions and seed origins. Yet, as expected, forest cover tended to have larger SoE than matrix openness, with fragmentation showing intermediate values. Response variables also followed the predicted SoE pattern (abundance < diversity < species richness).
Conclusions
Forest cover has larger SoE than matrix openness, possibly because forest cover is related to large-scale processes (e.g. long-distance dispersal) and matrix openness may drive small-scale processes (e.g. edge effects). Species richness may have larger SoE because of its dependence on long-distance dispersal. Therefore, to accurately assess the effect of landscape structure on seed dispersal, the optimal scale of analysis depends on predictor and response variables.
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Acknowledgements
We are grateful to Felix Eigenbrod and two meticulous reviewers for providing substantial and constructive feedback, which significantly improved the previous versions of this manuscript. We are also grateful to the owners of the study forest patches in the Lacandona and Los Tuxtlas regions for allowing us to work in their properties. PAPIIT-DGAPA, UNAM (Project IN-204215), and Rufford Small Grants (16237-1) provided financial support. This paper constitutes a partial fulfillment of the Programa de Posgrado en Ciencias Biológicas of the Universidad Nacional Autónoma de México. M.S.J. obtained a scholarship from CONACyT, Mexico. V.A.-R. thanks PASPA-DGAPA-UNAM for funding his sabbatical stay at the Geomatics and Landscape Ecology Laboratory, Carleton University. Part of this manuscript was written while M.S.J. was on a research stay at the Integrative Ecology Group from Estación Biológica de Doñana. A. Jamangapé and S. Pérez provided field assistance. E. Martínez (MEXU national herbarium), S. Sinaca and G. Jamangapé helped with species identification. Sergio Nicasio-Arzeta digitized the maps. We also thank the support (infrastructure, logistics and administration team) provided by the Instituto de Investigaciones en Ecosistemas y Sustentabilidad, UNAM. H. Ferreira, A. Valencia and A. López provided technical support.
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San-José, M., Arroyo-Rodríguez, V., Jordano, P. et al. The scale of landscape effect on seed dispersal depends on both response variables and landscape predictor. Landscape Ecol 34, 1069–1080 (2019). https://doi.org/10.1007/s10980-019-00821-y
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DOI: https://doi.org/10.1007/s10980-019-00821-y